--- /dev/null
+/*
+ * motu-protocol-v2.c - a part of driver for MOTU FireWire series
+ *
+ * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include "motu.h"
+
+#define V2_CLOCK_STATUS_OFFSET 0x0b14
+#define V2_CLOCK_RATE_MASK 0x00000038
+#define V2_CLOCK_RATE_SHIFT 3
+#define V2_CLOCK_SRC_MASK 0x00000007
+#define V2_CLOCK_SRC_SHIFT 0
+
+#define V2_IN_OUT_CONF_OFFSET 0x0c04
+#define V2_OPT_OUT_IFACE_MASK 0x00000c00
+#define V2_OPT_OUT_IFACE_SHIFT 10
+#define V2_OPT_IN_IFACE_MASK 0x00000300
+#define V2_OPT_IN_IFACE_SHIFT 8
+#define V2_OPT_IFACE_MODE_NONE 0
+#define V2_OPT_IFACE_MODE_ADAT 1
+#define V2_OPT_IFACE_MODE_SPDIF 2
+
+static int v2_get_clock_rate(struct snd_motu *motu, unsigned int *rate)
+{
+ __be32 reg;
+ unsigned int index;
+ int err;
+
+ err = snd_motu_transaction_read(motu, V2_CLOCK_STATUS_OFFSET, ®,
+ sizeof(reg));
+ if (err < 0)
+ return err;
+
+ index = (be32_to_cpu(reg) & V2_CLOCK_RATE_MASK) >> V2_CLOCK_RATE_SHIFT;
+ if (index >= ARRAY_SIZE(snd_motu_clock_rates))
+ return -EIO;
+
+ *rate = snd_motu_clock_rates[index];
+
+ return 0;
+}
+
+static int v2_set_clock_rate(struct snd_motu *motu, unsigned int rate)
+{
+ __be32 reg;
+ u32 data;
+ int i;
+ int err;
+
+ for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
+ if (snd_motu_clock_rates[i] == rate)
+ break;
+ }
+ if (i == ARRAY_SIZE(snd_motu_clock_rates))
+ return -EINVAL;
+
+ err = snd_motu_transaction_read(motu, V2_CLOCK_STATUS_OFFSET, ®,
+ sizeof(reg));
+ if (err < 0)
+ return err;
+ data = be32_to_cpu(reg);
+
+ data &= ~V2_CLOCK_RATE_MASK;
+ data |= i << V2_CLOCK_RATE_SHIFT;
+
+ reg = cpu_to_be32(data);
+ return snd_motu_transaction_write(motu, V2_CLOCK_STATUS_OFFSET, ®,
+ sizeof(reg));
+}
+
+static int v2_get_clock_source(struct snd_motu *motu,
+ enum snd_motu_clock_source *src)
+{
+ __be32 reg;
+ unsigned int index;
+ int err;
+
+ err = snd_motu_transaction_read(motu, V2_CLOCK_STATUS_OFFSET, ®,
+ sizeof(reg));
+ if (err < 0)
+ return err;
+
+ index = be32_to_cpu(reg) & V2_CLOCK_SRC_MASK;
+ if (index > 5)
+ return -EIO;
+
+ /* To check the configuration of optical interface. */
+ err = snd_motu_transaction_read(motu, V2_IN_OUT_CONF_OFFSET, ®,
+ sizeof(reg));
+ if (err < 0)
+ return err;
+
+ switch (index) {
+ case 0:
+ *src = SND_MOTU_CLOCK_SOURCE_INTERNAL;
+ break;
+ case 1:
+ if (be32_to_cpu(reg) & 0x00000200)
+ *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_OPT;
+ else
+ *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_OPT;
+ break;
+ case 2:
+ *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX;
+ break;
+ case 4:
+ *src = SND_MOTU_CLOCK_SOURCE_WORD_ON_BNC;
+ break;
+ case 5:
+ *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_DSUB;
+ break;
+ default:
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int v2_switch_fetching_mode(struct snd_motu *motu, bool enable)
+{
+ /* V2 protocol doesn't have this feature. */
+ return 0;
+}
+
+static void calculate_fixed_part(struct snd_motu_packet_format *formats,
+ enum amdtp_stream_direction dir,
+ enum snd_motu_spec_flags flags,
+ unsigned char analog_ports)
+{
+ unsigned char pcm_chunks[3] = {0, 0, 0};
+
+ formats->msg_chunks = 2;
+
+ pcm_chunks[0] = analog_ports;
+ pcm_chunks[1] = analog_ports;
+ if (flags & SND_MOTU_SPEC_SUPPORT_CLOCK_X4)
+ pcm_chunks[2] = analog_ports;
+
+ if (dir == AMDTP_IN_STREAM) {
+ if (flags & SND_MOTU_SPEC_TX_MICINST_CHUNK) {
+ pcm_chunks[0] += 2;
+ pcm_chunks[1] += 2;
+ }
+ if (flags & SND_MOTU_SPEC_TX_RETURN_CHUNK) {
+ pcm_chunks[0] += 2;
+ pcm_chunks[1] += 2;
+ }
+ } else {
+ /*
+ * Packets to v2 units transfer main-out-1/2 and phone-out-1/2.
+ */
+ pcm_chunks[0] += 4;
+ pcm_chunks[1] += 4;
+ }
+
+ /*
+ * All of v2 models have a pair of coaxial interfaces for digital in/out
+ * port. At 44.1/48.0/88.2/96.0 kHz, packets includes PCM from these
+ * ports.
+ */
+ pcm_chunks[0] += 2;
+ pcm_chunks[1] += 2;
+
+ /* This part should be multiples of 4. */
+ formats->fixed_part_pcm_chunks[0] = round_up(2 + pcm_chunks[0], 4) - 2;
+ formats->fixed_part_pcm_chunks[1] = round_up(2 + pcm_chunks[1], 4) - 2;
+ if (flags & SND_MOTU_SPEC_SUPPORT_CLOCK_X4)
+ formats->fixed_part_pcm_chunks[2] =
+ round_up(2 + pcm_chunks[2], 4) - 2;
+}
+
+static void calculate_differed_part(struct snd_motu_packet_format *formats,
+ enum snd_motu_spec_flags flags,
+ u32 data, u32 mask, u32 shift)
+{
+ unsigned char pcm_chunks[3] = {0, 0};
+
+ /*
+ * When optical interfaces are configured for S/PDIF (TOSLINK),
+ * the above PCM frames come from them, instead of coaxial
+ * interfaces.
+ */
+ data = (data & mask) >> shift;
+ if ((flags & SND_MOTU_SPEC_HAS_OPT_IFACE_A) &&
+ data == V2_OPT_IFACE_MODE_ADAT) {
+ pcm_chunks[0] += 8;
+ pcm_chunks[1] += 4;
+ }
+
+ /* At mode x4, no data chunks are supported in this part. */
+ formats->differed_part_pcm_chunks[0] = pcm_chunks[0];
+ formats->differed_part_pcm_chunks[1] = pcm_chunks[1];
+}
+
+static int v2_cache_packet_formats(struct snd_motu *motu)
+{
+ __be32 reg;
+ u32 data;
+ int err;
+
+ err = snd_motu_transaction_read(motu, V2_IN_OUT_CONF_OFFSET, ®,
+ sizeof(reg));
+ if (err < 0)
+ return err;
+ data = be32_to_cpu(reg);
+
+ calculate_fixed_part(&motu->tx_packet_formats, AMDTP_IN_STREAM,
+ motu->spec->flags, motu->spec->analog_in_ports);
+ calculate_differed_part(&motu->tx_packet_formats, motu->spec->flags,
+ data, V2_OPT_IN_IFACE_MASK, V2_OPT_IN_IFACE_SHIFT);
+
+ calculate_fixed_part(&motu->rx_packet_formats, AMDTP_OUT_STREAM,
+ motu->spec->flags, motu->spec->analog_out_ports);
+ calculate_differed_part(&motu->rx_packet_formats, motu->spec->flags,
+ data, V2_OPT_OUT_IFACE_MASK, V2_OPT_OUT_IFACE_SHIFT);
+
+ motu->tx_packet_formats.midi_flag_offset = 4;
+ motu->tx_packet_formats.midi_byte_offset = 6;
+ motu->tx_packet_formats.pcm_byte_offset = 10;
+
+ motu->rx_packet_formats.midi_flag_offset = 4;
+ motu->rx_packet_formats.midi_byte_offset = 6;
+ motu->rx_packet_formats.pcm_byte_offset = 10;
+
+ return 0;
+}
+
+const struct snd_motu_protocol snd_motu_protocol_v2 = {
+ .get_clock_rate = v2_get_clock_rate,
+ .set_clock_rate = v2_set_clock_rate,
+ .get_clock_source = v2_get_clock_source,
+ .switch_fetching_mode = v2_switch_fetching_mode,
+ .cache_packet_formats = v2_cache_packet_formats,
+};
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